That’s easy enough, i had a spare hour this morning and i just finished the bulkemailchecker extension, will upload it at end of the week and will be available at the start of the next week most likely

Bulk import in mailwizz already exists, it’s in the web interface and you have to keep your browser window open of course since it does ajax calls.

However, in dev version of mailwizz you can import from command line, or you can set a folder to be watched by an import daemon and when files added in that folder, the daemon will detect this and start importing.

What if you try to access: /backend/index.php/extensions/kickbox/settings, does it do it ?

Anyway, this is weird, can you try to disable and remove it and then reinstall it? Maybe it’s a caching issue or something, so try to remove the contents of apps/common/runtime folder (or rename it to smth else and create a new folder called runtime with 0777 permissions)

If the above does not cut it, just open a support ticket at mailwizz forums, https://forum.mailwizz.com and we can pick it up from there.